Initial build infrastructure

Contains the initial build infrastructure. Cmake was chosen for
portability reasons.

1 files changed, 43 insertions, 0 deletions

diff --git a/cmake/GitVersionGen.cmake b/cmake/GitVersionGen.cmake
new file mode 100644
index 00000000..53ac166d
--- /dev/null
+++ b/cmake/GitVersionGen.cmake
@@ -0,0 +1,43 @@
+macro(GIT_VERSION_GEN)
+
+include(FindGit)
+if(NOT GIT_FOUND)
+  message(FATAL_ERROR "This is not a git repository")
+endif()
+
+find_program(SORT "sort")
+mark_as_advanced(SORT)
+if (${SORT} STREQUAL "")
+  message(FATAL_ERROR "Cannot find the sort executable")
+endif()
+
+find_program(TAIL "tail")
+mark_as_advanced(TAIL)
+if (${TAIL} STREQUAL "")
+  message(FATAL_ERROR "Cannot find the tail executable")
+endif()
+
+execute_process(
+    COMMAND ${GIT_EXECUTABLE} tag -l -n0
+    COMMAND ${SORT} -V
+    COMMAND ${TAIL} -n 1
+    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+    OUTPUT_VARIABLE _git_tag
+    RESULT_VARIABLE _git_result
+    OUTPUT_STRIP_TRAILING_WHITESPACE)
+if(NOT ${_git_result} EQUAL 0)
+  message(FATAL_ERROR "Cannot fetch repository tag")
+endif()
+message(STATUS "Repository tag is: ${_git_tag}")
+
+string(REGEX REPLACE
+  "[^0-9]*([0-9]+)\\.[0-9]+.*" "\\1"
+  _version_major "${_git_tag}")
+string(REGEX REPLACE
+  "[^0-9]*[0-9]+\\.([0-9]+).*" "\\1"
+  _version_minor "${_git_tag}")
+
+set(PACKAGE_VERSION_MAJOR "${_version_major}")
+set(PACKAGE_VERSION_MINOR "${_version_minor}")
+
+endmacro(GIT_VERSION_GEN)